Social media superstars Zoe Sugg (aka Zoella!) and Tyler Oakley are famous for sharing their lives with us on YouTube, but as we learned when they sat down with us for the cover of our October social issue, they didn't always feel comfortable sharing ~everything.~ We talked to the pair about the personal issues they deal with behind the scenes, like anxiety and body image.

"A lot of young people look at me and think, She has the perfect life: She's got the boyfriend, the house, the dog, the book, the successful YouTube channel," Zoe shared. "Not everything is perfect… Sometimes I have days where I don't want to leave my bed, or I'll have multiple panic attacks."

She also candidly talked about her fear of traveling. "When I came to YouTube, it was comforting to sit and make video diaries," Zoe told us. "It wasn't that scary. It was only when things started happening. 'You've been invited to an event in London — hop on the train!' That's definitely out of my comfort zone. Sometimes I'm really confident as Zoe. When it comes to picking up an award in front of 9,000 people, I'm like [snaps], I can do that. But the Zoe part of me is like, 'Trains are scary!' It's as if I have two different sides."

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As for Tyler, just because he looks at ease on screen doesn't mean that's always the case. He still deals with body image issues, even years after struggling with an eating disorder.

"With videos, meet and greets, and a million pictures a day, it's definitely a thing that I think about," he told us. "It's not about clothes fitting. It's not about feeling chubbier than normal. I'd beat myself up over a day that I'm not active. If I'm lazy, then I feel grody."

He's usually open and honest with his fans in his videos, but when it came to his eating disorder struggle, he stayed quiet until now.

"Talking about it is really hard because it's something I suppress and work through every day. And I haven't really talked about body image in videos. I assume when people read this, they'll be like, 'Oh, you're not fat.' That's not what it's about at all. Even when I was the skinniest I'd ever been, I was still not happy."

Bella Howard/Seventeen

Read all about their journeys in the October issue of Seventeen, out September 15. You'll also find out about their adorable friendship: They met after skyrocketing to stardom on YouTube, but their bond runs way deeper than their combined 16 million subscribers.

"I instantly felt like we'd been mates forever, and you never feel like there's any distance," Zoe told us.

"She accepts people for who they," Tyler added. "She's never questioned anything about me. I can just be me."

So, obviously, We had to ask: what can they spill about their best friend that nobody else would ever know?

"Oh, the things I could say right now," Zoe said with a big laugh. "I would say that he's a lot more sensitive than people think. He's got this really great confident sassiness, but he can also be soft and cuddly. Like a little teddy bear or a marshmallow."

Tyler revealed Z's goofy side.

"She messes with me all the time," he said. "She filmed me naked! I was at her place taking a shower. She burst in, filming me. She's cackling; I'm screaming. I finished my shower and ran out, and she's on the bed, laughing. She's literally crazy and so spur of the moment."

Pick up the October issue of Seventeen, on newsstands September 15, for more from Tyler and Zoe's interview. You can also subscribe to the digital issue here.

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